CN109386571B

CN109386571B - Pendulum torsional vibration reduction device

Info

Publication number: CN109386571B
Application number: CN201810893545.8A
Authority: CN
Inventors: 西田秀之; 天野浩之; 堀田修平; 铃木裕二
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2017-08-09
Filing date: 2018-08-08
Publication date: 2021-03-16
Anticipated expiration: 2038-08-08
Also published as: JP2019032046A; US20190048971A1; CN109386571A; JP6791057B2; US10385942B2

Abstract

The invention provides a pendulum type torsional vibration reduction device capable of suppressing the movement amount and the inclination angle (inclination amount) of a connection member in the axial direction. A restriction section (36(38)) is provided on at least one of the inner surfaces of the connecting member (4) and the housing (18), and when the connecting member (4) moves in the direction of the rotation axis of the rotating body (2) so as to approach the inner surface of the housing (18) or is inclined with respect to the rotation axis, the restriction section (36(38)) contacts the connecting member (4) or the inner surface of the housing (18), and the distance between the housing (18) and the rotating body (3) in the direction of the rotation axis is shorter than the thickness of the connecting member (4) in the direction of the rotation axis.

Description

Pendulum torsional vibration reduction device

Technical Field

The present invention relates to a device for reducing torsional vibration by utilizing reciprocating motion or oscillating motion of a rotating body.

Background

Patent document 1 describes such a device. The torsional vibration reduction device described in patent document 1 includes a disk-shaped rotating body that receives torsional vibration, and a plurality of rolling chambers that extend in the circumferential direction of the rotating body are formed in the rotating body, and rolling bodies are disposed in each of the plurality of rolling chambers. In the torsional vibration reduction device described in patent document 1, when the rotating body receives a torque and rotates, and the rotating body is pressed against the rotating surface of the rotating chamber by a centrifugal force to generate torque fluctuation, the rotating body reciprocates in the circumferential direction along the rotating surface to reduce vibration.

In addition, the torsional vibration reduction device described in patent document 1 is provided with a connecting member that holds the respective rolling elements at predetermined intervals in the circumferential direction of the rotating body. Specifically, the connecting member is provided with: the rotating body includes an annular support portion (annular portion) provided along a side surface of the rotating body, and a contact portion (claw portion) protruding outward in a radial direction from an outer peripheral portion of the support portion and supporting the rotating body from both sides in a circumferential direction of the rotating body. Further, the rotating body and the coupling member are covered with a case (cover) at a portion on the outer peripheral side of the rotating body.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-114170

Disclosure of Invention

Problems to be solved by the invention

As described above, in the torsional vibration reduction device described in patent document 1, when the rotating body receives a torque and rotates, the rotating body is pressed against the rotating surface. When torque fluctuation occurs, the rotating body reciprocates along the rotating surface. On the other hand, in such a state, for example, when the rotating body is moved (reciprocated) or tilted in the direction of the rotation axis of the rotating body (hereinafter, simply referred to as the axial direction) by vibration of the engine or external disturbance, the connecting member is also moved or tilted in the axial direction. In this case, for example, there is a fear that the connecting member moves to the inner surface side of the housing and is separated from the rotating body, or the connecting member is inclined with respect to the axial direction and is sandwiched between the rotating body and the housing. Further, when the connecting member is sandwiched between the rotating body and the housing in this way, the connecting member cannot support the rotating body accurately, and therefore, there is a possibility that the trajectory of the reciprocating motion (oscillating motion) of the rotating body does not become as assumed in design, and there is room for improvement in this point.

The present invention has been made in view of the above-described technical problem, and an object thereof is to provide a pendulum type torsional vibration reduction device capable of suppressing the amount of movement and the inclination angle (inclination amount) of a connection member in the axial direction.

Means for solving the problems

In order to achieve the above object, the present invention provides a pendulum type torsional vibration reduction device comprising: a rotating body that is rotated by transmission of torque; a rotating chamber formed in the rotating body in parallel in a circumferential direction; a plurality of rotating bodies held by the rotating body in a state of being inserted into the rotating chamber; a connecting member that connects the plurality of rotating bodies so as to maintain a predetermined interval in a circumferential direction of the rotating bodies, and that rotates relative to the rotating bodies in accordance with movement of the rotating bodies in the rotating chambers; and a housing mounted to the rotating body so as to cover the rotating body and the coupling member, the rotating body reciprocates along the rotating chamber in the rotating chamber by torque fluctuation acting on the rotating body, and the torque fluctuation is reduced by the reciprocating motion of the rotating body, wherein a restricting portion is provided on at least one of the connecting member and an inner surface of the housing, in the case where the connection member moves in the direction of the rotation axis of the rotation body in such a manner as to approach the inner surface of the housing or is inclined with respect to the rotation axis, the regulating portion is in contact with the connecting member or an inner surface of the housing, and a distance between the housing and the rotor in the direction of the rotation axis becomes shorter than a thickness of the connecting member in the direction of the rotation axis.

In addition, in the present invention, the restricting portion may be provided to the connecting member and formed to protrude toward an inner surface of the housing.

In addition, in the present invention, the coupling member may have an annular portion having an outer diameter such that it does not contact the rotating body in the rotating chamber, and a claw portion provided to protrude outward in a radial direction from an outer peripheral portion of the annular portion and holding the rotating body with respect to a circumferential direction of the rotating body from both sides in the circumferential direction of the rotating body, the regulating portion being formed at the claw portion.

In addition, in the present invention, the restricting portion may be formed at a portion of the claw portion where a distance between the housing and the connecting member in the direction of the rotation axis is shortest.

In addition, in the present invention, the coupling member may have an annular portion having an outer diameter such that it does not contact the rotating body in the rotation chamber, and a claw portion provided to protrude outward in a radial direction from an outer peripheral portion of the annular portion and contacting from both sides in a circumferential direction of the rotating body and holding the rotating body with respect to the circumferential direction of the rotating body, the regulating portion being formed on an inner surface of the housing and protrudingly formed at a portion opposing the claw portion in a direction of the rotation axis.

In the present invention, the housing may be configured by a first case member and a second case member with the rotating body interposed therebetween, and the size of the regulating portion may be the same size or different sizes on the first case member side and the second case member side.

In the present invention, the housing may be configured by a first case member and a second case member that are different in shape from each other with the rotating body interposed therebetween.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the regulating portion that regulates the amount of movement and the inclination angle (inclination amount) of the connecting member in the axial direction is provided to the connecting member or the housing. Specifically, the rotating body is disposed in a rotating chamber formed in the rotating body, the rotating chamber being long in the circumferential direction of the rotating body, and when the torque acting on the rotating body changes, the rotating body pushed by the centrifugal force against the inner surface of the rotating chamber reciprocates inside the rotating chamber, and the torque fluctuation is reduced by the moment of inertia of the rotating body at the time of reciprocation. In addition, a regulating portion for regulating the amount of movement and the inclination angle of the connecting member in the axial direction is provided in at least one of the connecting member for connecting the rotating bodies in the circumferential direction of the rotating body and the case for covering the connecting member and the rotating bodies. In addition, in the case where the coupling member moves in the direction of the rotation axis of the rotating body so as to approach the inner surface of the housing or is inclined with respect to the rotation axis, the regulating portion comes into contact with the coupling member or the inner surface of the housing, and at this time, the distance between the housing and the rotating body in the direction of the rotation axis becomes shorter than the thickness of the coupling member in the direction of the rotation axis.

Therefore, even when the connecting member moves or tilts in the axial direction, since the restricting portion contacts the inner surface of the housing or the connecting member, the amount of movement of the connecting member in the axial direction and the tilt angle are restricted, and as a result, the connecting member can be prevented from being sandwiched between the rotating body and the housing. In addition, in the case where the centrifugal force pressing the rolling elements against the inner surface of the rolling chamber is small, such as when the rolling elements are slowly rotated, the rolling elements tend to fall due to gravity, but the rolling elements are supported by the coupling members, and the gravity generated by the rolling elements on both sides across the center of the coupling members is balanced via the coupling members, so that free fall (gravity fall) of the rolling elements and the resulting impact sound can be suppressed or avoided. Further, since such a trouble that the coupling member is sandwiched between the rotating body and the housing or the coupling member cannot accurately support the rotating body does not occur at the time of free fall of the rotating body, a locus of the swinging motion of the rotating body can be formed as designed, and a desired vibration damping performance can be obtained.

Further, according to the present invention, the restricting portion is formed in the claw portion of the connecting member. Specifically, the coupling member is composed of an annular portion and claw portions provided to protrude radially outward from an outer peripheral portion of the annular portion, and holding the rotating body from both sides in the circumferential direction of the rotating body. The restriction portion is formed in the claw portion. Further, the restricting portion is formed at a portion of the claw portion where the distance between the connecting member and the housing in the axial direction becomes shortest. Therefore, the size of the restricting portion (i.e., the amount of increase in the claw portion) can be minimized, and the amount of movement and the inclination angle of the connecting member can be restricted without excessively increasing the mass of the connecting member.

Further, according to the present invention, the housing is constituted by the first shell member and the second shell member sandwiching the rotating body, and the shape of each of these shell members and the distance between each of the shell members and the rotating body are appropriately changed. Accordingly, the size of the regulating portion is also set to an appropriate size on the first case member side and the second case member side. Therefore, the shape of each case member and the size of the regulating portion can be appropriately determined in accordance with the space in which the pendulum torsional vibration reducer is mounted, in other words, the degree of freedom in design can be improved.

Drawings

Fig. 1 is a diagram illustrating a pendulum torsional vibration reduction device according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a schematic diagram schematically showing a structure of a torque converter housing the pendulum torsional vibration reduction device of fig. 1.

Fig. 4 is a sectional view taken along line IV-IV of fig. 1.

Fig. 5 is a sectional view taken along line V-V of fig. 1.

Fig. 6 shows a modified example of fig. 2, fig. 6(a) shows an example in which the distances between the respective case members and the rotating body are different, fig. 6(b) shows an example in which the shapes of the respective case members are different, and fig. 6(c) shows an example in which the shapes of the respective case members are different and the amount of increase of the claw portions is different on the side of the respective case members.

Fig. 7 is a diagram illustrating another example of the pendulum torsional vibration reduction device according to the embodiment of the present invention.

Fig. 8 is a diagram showing a modification of fig. 7, fig. 8(a) is a diagram showing an example in which the distances between the respective case members and the rotating body are different, fig. 8(b) is a diagram showing an example in which the shapes of the respective case members are different, and fig. 8(c) is a diagram showing an example in which the shapes of the respective case members are different and the amount of increase of the claw portion is different on the side of the respective case members.

Detailed Description

Next, an embodiment of the present invention will be described with reference to the drawings. The pendulum type torsional vibration reduction device 1 according to the embodiment of the present invention is a device that reduces fluctuation (torsional vibration) of torque transmitted from an engine to a transmission by reciprocating motion (pendulum motion) of a pendulum mass body held by a rotating body to which the torque is transmitted, for example, in a vehicle. In the pendulum-type torsional vibration reduction device 1 according to the embodiment of the present invention, the pendulum mass body is constituted by a rolling body, and fig. 1 and 2 show an example of the pendulum-type torsional vibration reduction device 1. In the example shown here, the rotary body 2 that rotates by transmitting torque, the plurality of rolling elements 3 held by the rotary body 2, and the coupling member 4 that couples the rolling elements 3 to each other are mainly configured. Next, the structure of the pendulum torsional vibration reduction device 1 will be specifically described.

Fig. 1 is a diagram schematically showing an example of a pendulum type torsional vibration reduction device 1, in which a rotating body 2 is an annular plate-shaped member, rotates upon receiving a torque, and undergoes torsional vibration by a fluctuation of the torque. The rotary body 2 is attached to a rotary member such as a crankshaft of an engine not shown in the figure or a propeller shaft or an axle for transmitting a driving force to wheels not shown in the figure so that a rotation center line thereof is horizontal or lateral. In addition, the rotor 2 is provided with a rotation chamber 5 at a position greatly deviated from the rotation center O in the radial direction.

The rolling chamber 5 is formed in an appropriate shape and size in which the rolling element 3 disposed inside thereof can reciprocate (or perform a swinging motion) within a predetermined range, and more specifically, is formed as an arc-shaped elongated hole which is long in the circumferential direction of the rolling element 2 and whose longitudinal center portion protrudes outward in the radial direction of the rolling element 2, and penetrates the rolling element 2 in the plate thickness direction. The center of curvature of the arc is set at a position offset to the outer circumferential side from the center O of the rotating body 2, and thus, the center of curvature of the arc is smaller than the radius of the position where the rolling chamber 5 is provided (the radius from the center of the rotating body 2). The shape of the rolling chamber 5 may be a simple circular shape, in addition to the so-called long hole shape that is long in the circumferential direction as described above. The plurality of rolling chambers 5 are formed at predetermined intervals in the circumferential direction of the rolling body 2.

An inner wall surface (a surface facing the center O side of the rotating body 2) on the outer side in the radial direction of the rotating body 2 among the inner wall surfaces of the rotating chamber 5 is a rotating surface 6 on which the rotating body 3 is swung by a fluctuation of the torque of the rotating body 2, that is, torsional vibration. The shape of the rotation surface 6 is an arc surface having a smaller radius than the size from the rotation center O to the rotation surface 6 (i.e., the radius in the rotating body 2) or a curved surface similar to an arc surface. Accordingly, the rotating surface 6 has a curvature larger than that of the outer peripheral surface of the rotating body 2 and is a curved surface (arc surface) that protrudes outward in the radial direction of the rotating body 2.

The rotor 3 is an inertial mass body that oscillates by an inertial force when the torque of the rotor 2 varies, and is a member formed in a circular cross section such as a cylindrical shape or a disc shape having a short axial length so as to rotate along the rotation plane 6. In the embodiment of the present invention, the rolling element 3 is formed so that its cross-sectional shape is a so-called "H" shape as shown in fig. 2. According to this configuration, the large-diameter flange portions 7a and 7b at the left and right ends are engaged with the both side surfaces of the rotating body 2 in a contact manner, and therefore, the rolling body 3 can be prevented from coming out of the rolling chamber 5 in the axial direction. As shown in fig. 2, the rotor 3 is provided with a first mass body 8 and a second mass body 9 and has a split structure.

To explain this structure, first, the first mass body 8 is provided with the hollow cylindrical shaft portion 10 and one of the above-described "H" -shaped flange portions 7 a. The shaft portion 10 has an axial length longer than the plate thickness (length in the axial direction) of the rotor 2 and is formed to protrude from the rotor chamber 5, and the outer diameter of the shaft portion 10 is slightly smaller than the size of the narrowest portion of the opening width of the rotor chamber 5 in the radial direction, so that the rotor 3 can rotate (move) on the rotor surface 6 without sliding contact with the inner wall surface of the rotor chamber 5. Therefore, a gap or so-called backlash exists between the outer peripheral surface 11 of the shaft portion 10 of the rotating body 3 and the inner wall surface of the rotating chamber 5. The outer peripheral surface 11 of the shaft portion 10 is a portion that contacts the rotating surface 6, and the outer peripheral surface 11 is pressed against the rotating surface 6 by a centrifugal force. The flange portion 7a is formed integrally with the shaft portion 10 at one end portion in the axial direction of the shaft portion 10, and projects outward in the radial direction from the shaft portion 10. The flange portion 7a has an outer diameter larger than the shaft portion 10 and is formed larger than the opening width of the rotation chamber 5 in the radial direction.

On the other hand, the second mass body 9 is equipped with: a shaft portion 12 having an outer diameter substantially the same as the inner diameter of the hollow cylindrical shaft portion 10 of the first mass body 8, and the other flange portion 7b of the "H" shaped flange portions 7a and 7 b. The axial length of the shaft portion 12 is formed longer than the plate thickness of the rotor 2, and the outer diameter of the shaft portion 12 is formed to be substantially the same as the inner diameter of the shaft portion 10 of the first mass body 8 as described above. That is, the shaft portion 10 in the first mass body 8 has a hollow cylindrical portion 13 recessed in the axial direction, whereas the shaft portion 10 in the second mass body 9 has a cylindrical portion 14 press-fitted into the hollow cylindrical portion 13 or closely contacted and fitted with the hollow cylindrical portion 13. The flange portion 7b is formed to face the flange portion 7a, and like the flange portion 7a, the flange portion 7b is formed to have an outer diameter integrally with the shaft portion 12 at the other end portion in the axial direction of the shaft portion 12 and to be larger than the opening width of the rolling chamber 5 in the radial direction.

Next, the connecting member 4 will be described. As shown in fig. 1, the connection member 4 is a retainer for loosely holding the respective rolling bodies 3 and holding the respective rolling bodies 3 at a predetermined interval from each other in the circumferential direction of the rolling body 2. In the following description, the connecting member is referred to as a holder 4. The retainer 4 is composed of a pair of ring members disposed on both sides across the rotating body 2, each ring member having a ring portion 4a and a plurality of pairs of claw portions 4b, the inner diameter of the ring portion 4a being equal to or larger than the inner diameter of the through hole 15 in the rotating body 2, the outer diameter of the ring portion 4a being equal to or smaller than the size of a portion from the center O of the rotating body 2 to the innermost circumference side in the rotating chamber 5, the plurality of pairs of claw portions 4b protruding outward in the radial direction from the ring portion 4a and being provided corresponding to each rotating body 3.

The claw portions 4b are provided to contact and support the rolling elements 3 provided correspondingly from both sides in the circumferential direction of the rolling element 2, and project to positions facing the outer circumferential surfaces of the flange portions 7a and 7b of the rolling element 3 located inside the rolling chamber 5 in the circumferential direction of the rolling element 2. Further, the interval between the pair of claw portions 4b provided corresponding to each of the rolling bodies 3 is larger than the outer diameter of the flange portions 7a, 7b, and thus the claw portions 4b loosely hold the rolling bodies 3. Further, the interval between the pair of claw portions 4b is shorter than a length obtained by measuring the length of the rotating chamber 5 in the circumferential direction of the rotating body 2. This is to cause the claw portions 4b to hold the rotating body 3 in a range where the rotating body 3 does not contact the end portion 5a of the rotating chamber 5. Further, the holder 4 is preferably a light-weight holder having a small sliding resistance. Thus, for example, is composed of a resin material.

The holder 4 is configured to rotate within a predetermined angular range around the center O of the rotating body 2. Therefore, in the embodiment of the present invention, the guide pin 16 and the guide hole 17 are provided. One of the guide pin 16 and the guide hole 17 is provided in the annular portion 4a, and the other is provided in the rotary body 2. In the example shown in fig. 1, the guide hole 17 is formed in the inner peripheral side of the rotary body 2 as an arc-shaped long hole centered on the center O of the rotary body 2. In addition, the length of the elongated hole is set to a length such that the claw portion 4b does not rotate beyond the end portion 5a of the rotation chamber 5.

On the other hand, the guide pins 16 are provided at positions corresponding to the guide holes 17 in the annular portion 4a of the holder 4. The retainer 4 in the pendulum torsional vibration reduction device 1 described here is composed of two annular members disposed on both sides with the rotor 2 interposed therebetween, and the guide pin 16 is provided along a direction parallel to the rotation center axis of the rotor 2, and these annular members are integrally connected in a state of penetrating through the guide hole 17. The outer diameter of the guide pin 16 is substantially equal to the opening width of the guide hole 17, so that the holder 4 rotates within the length range of the guide hole 17 (i.e., within a predetermined angular range) about the center O of the rotating body 2 by the guide pin 16 moving along the guide hole 17. In other words, the holder 4 is held by the guide pin 16 and the guide hole 17 so as to be relatively rotatable with respect to the rotating body 2. Therefore, since the load accompanying the holding of the retainer 4 does not act on the rolling member 3, smooth rotation of the rolling member 3 is ensured. The holder 4 is configured to be rotatable in the rotational direction within a predetermined angular range via the guide pin 16 and the guide hole 17 as described above, but is configured to be freely movable in the axial direction.

Since the vibration reducing action in the embodiment of the present invention is generated by the vibration in the rotational direction in the rotating body 2 caused by the fluctuation of the torque of the rotating body 2 and the accompanying moment of inertia of the rotating body 3, it is preferable that the rotating body 3 performs the swinging motion as smoothly as possible. Therefore, as shown in fig. 2, in order to perform the oscillating motion of the rotating body 3 without being hindered by oil of, for example, a fluid transmission device or a torque converter, the rotating body 3, the cage 4, and a region performing the oscillating motion are sealed in a liquid-tight state. That is, as shown in fig. 2, a portion from the intermediate portion to the outer peripheral end in the radial direction of the rotating body 2 is covered by the case 18 in a liquid-tight state. An example of assembling the pendulum torsional vibration reduction device 1 and the torque converter in the embodiment of the present invention will be described later.

When the case 18 is specifically described, the case 18 is constituted by a first case member 19 and a second case member 20, and as a whole, the cross section thereof is rectangular in shape. The

respective case members

19 and 20 cover the rolling element 3 and the region where the rolling element 3 performs the swing motion in a non-contact manner at the center portion bulging to the left and right. One end of the outer peripheral portion of each of the

case members

19 and 20 is defined as a dividing plane, and the outer peripheral end of the first case member 19 extends toward the second case member 20 while covering the outer peripheral end face of the rotor 2. The outer peripheral ends of the

case members

19 and 20 are joined and integrated by appropriate joining means such as welding. In the case where such a housing 18 is provided, the left and right ring-shaped members constituting the retainer 4 are held in the housing 18 so as not to be detached from the rotary body 2, and therefore, the guide pins 16 and the guide holes 17 described above may be omitted.

Fig. 3 shows an example in which the pendulum torsional vibration reduction device 1 according to the embodiment of the present invention is incorporated into the torque converter 21. To explain this structure simply, first, the structure of the torque converter 21 is the same as that of a conventionally known torque converter, and the front cover 22 connected to the engine and the pump housing 23 are integrated to form a housing as a whole of the torque converter 21. An input shaft 24 of the transmission is arranged along the central axis of the housing. A turbine hub 25 is integrally rotatably provided on an outer peripheral portion of the input shaft 24. The turbine 26, the lockup clutch 27, and the pendulum torsional vibration reduction device 1 are connected to the turbine hub 25.

The turbine 26 has a similar configuration to a conventionally known turbine, is disposed opposite the pump impeller 28, and is rotated by the oil flow generated by the pump impeller 28. The lockup clutch 27 is disposed to face the inner surface of the front cover 22, and is pressed against the front cover 22 by hydraulic pressure to form an engaged state in which torque is transmitted, and is released from the front cover 22 by a decrease in the hydraulic pressure to form a released state in which torque is not transmitted. The lockup clutch 27 is connected to the turbine hub 25 via a lockup damper 29 that is damped by an elastic force of a coil spring. The lockup damper 29 is equipped with a driving side member 30 connected to the lockup clutch 27 and a driven side member 32 connected to the driving side member 30 via a coil spring 31, the driven side member 32 being connected to the turbine hub 25. The driving side member 30 and the driven side member 32 are annular plate-shaped members. Further, a stator 33 is disposed between the pump impeller 28 and the turbine runner 26 at an inner peripheral portion thereof, and the stator 33 is connected to a fixed shaft 34 fitted to an outer peripheral portion of the input shaft 24 via a one-way clutch 35. The pendulum-type torsional vibration reduction device 1 is disposed between the turbine 26 and the lock-up clutch 27 or the lock-up damper 29.

In the pendulum torsional vibration reduction device 1 configured as described above, when the rotating body 2 receives torque and rotates, the rolling body 3 is pressed against the rolling surface 6. When torque fluctuation occurs, the rolling element 3 reciprocates along the rolling surface 6. On the other hand, although the retainer 4 is rotatable in the circumferential direction of the rotary body 2 within the range of the guide hole 17 as described above, since it is freely movable in the axial direction, in such a state, for example, when the rotary body 3 reciprocates or tilts in the axial direction due to vibration of the engine, external disturbance, or the like, there is a possibility that the retainer 4 moves or tilts in the axial direction and is sandwiched between the rotary body 3 and the housing 18. Therefore, in the embodiment of the present invention, the amount of movement and the inclination angle of the retainer 4 in the axial direction are restricted.

Specifically, as shown in fig. 2, the claw portion 4b of the holder 4 is formed with a projection 36 for regulating the amount of movement and the inclination angle of the holder 4 in the axial direction. The protrusion 36 corresponds to a restricting portion in the embodiment of the present invention, and in the example shown in fig. 2, is provided so that the tip portion 4c of the claw portion 4b protrudes toward the inner surface of the housing 18 in the axial direction. Specifically, the projection 36 is provided on each claw portion 4b of the holder 4 disposed on both sides with the rotor 2 interposed therebetween, and the projection 36 having a short distance from the housing 18 is formed at the tip end portion 4c of the claw portion 4b so as to regulate the amount of movement and the amount of inclination of the holder 4 in the axial direction. That is, the retainer 4 can be moved only to the first and

second case members

19 and 20 by the projection 36, and even if the retainer 4 is inclined, the retainer 4 is brought into contact with the first case member 19 or the second case member 20, and the retainer 4 is not separated from the rotor 3. In other words, in the case where the holder 4 moves in the axial direction of the rotary body 2 so as to approach the inner surface of the housing 18 or is inclined with respect to the rotation axis of the rotary body 2, the protrusion 36 restricts the amount of movement or the inclination angle of the holder 4 in the axial direction by coming into contact with the inner surface of the housing 18.

More specifically, in the example shown in fig. 2, the protrusion 36 is provided to the holder 4, and the protrusion 36 is configured to: when the holder 4 moves in the direction of the rotation axis of the rotary body 2 so as to approach the inner surface of the housing 18 (the first shell member 19 side or the second shell member 20 side) or is inclined with respect to the rotation axis and the protrusion 36 contacts the inner surface of the housing 18, the distance between the housing 18 and the rotor 3 in the axial direction becomes shorter than the thickness of the holder 4 in the axial direction. That is, by forming the projection portion 36 on the holder 4, the distance of the holder 4 in the axial direction (i.e., the thickness of the holder 4) becomes longer than the distance of the housing 18 and the rotator 3 in the axial direction. The distance between the housing 18 and the rolling element 3 is the shortest distance among the distances between the housing 18 and the rolling element 3 in the axial direction, and for example, when the rolling element 3 is inclined, the distance from the housing 18 to the surface of the rolling element 3 that protrudes most toward the housing 18.

Further, when describing the projecting portion 36 in relation to the rotary body 2, the rotary body 3, and the retainer 4, the distance in the axial direction from the position where the rotary body 2 is held by the retainer 4 when the projecting portion 36 is in contact with the inner surface of the housing 18 (for example, the first case member 19) is shorter than the distance in the axial direction from the end portion on the inner surface side of the first case member 19 of the rotary body 3 when the rotary body 2 is moved in the direction away from the inner surface of the first case member 19 in the axial direction from the rotary body 3. In other words, by forming the projection 36 on the claw portion 4b, even when the retainer 4 is moved maximally in the axial direction from a predetermined position or is tilted, the retainer 4 and the rotating body 3 are overlapped (superposed) in the radial direction, and the retainer 4 can hold (support) the rotating body 2. The protrusion 36 is made of, for example, a resin material, as in the holder 4.

Fig. 4 shows a cross section at the root portion of the claw 4b, and fig. 5 shows a cross section at the leading end portion 4c of the claw 4 b. As described above, in the embodiment of the present invention, the protrusion 36 is provided at the distal end portion 4c of the claw portion 4b, and regulates the amount of movement and the inclination angle of the retainer 4 in the axial direction. Accordingly, although the cross section of the root portion of the claw portion 4b shown in fig. 4 is a simple T-shaped cross section, the cross section of the tip portion 4c of the claw portion 4b shown in fig. 5 is a T-shaped cross section that projects toward the case 18 by an amount corresponding to the projection 36 because the projection 36 that increases the amount of the claw portion 4b is formed on the case 18 side. As shown in fig. 4 and 5, the claw portion 4b is provided with a rib 37. This is a member for securing rigidity of the portions of the claw portions 4b which come into contact with the flange portions 7a and 7b of the rotating body 3, and a minimum rib 37 is formed in consideration of rigidity in order to reduce the thickness.

In addition, it is desirable that the mass of the holder 4 is lightweight. Therefore, in the embodiment of the present invention, the protrusion 36 is provided at a position where the distance from the case 18 becomes the shortest among the claw portions 4 b. The portion having the shortest distance corresponds to the distal end portion 4c of the claw portion 4b in the embodiment of the present invention. Accordingly, the mass of the projection 36 can be reduced, and therefore, the weight of the retainer 4 can be reduced. As described with reference to fig. 3, the pendulum torsional vibration reduction device 1 is assembled inside the torque converter 21, and therefore the case 18 covering the pendulum torsional vibration reduction device 1 may be deformed by the centrifugal hydraulic pressure of the torque converter 21. Therefore, in consideration of the deformation of the housing 18, the projection 36 formed on the claw portion 4b is formed on the claw portion 4b in a state where a predetermined gap is provided between the projection 36 and the housing 18. Thus, even in the case where the housing 18 is deformed, the protrusion 36 can be prevented from contacting the housing 18.

Further, in the example shown in fig. 2, the distance in the axial direction of the first case member 19 in the case 18 from the rotary body 2 and the distance in the axial direction of the second case member 20 in the case 18 from the rotary body 2 are the same. Therefore, the thickness of the protruding portion 36 provided to the claw portion 4b, that is, the amount of increase in the retainer 4 is the same between the front side and the back side across the rotating body 2.

Next, the operation of the pendulum torsional vibration reduction device 1 will be described. As described above, for example, since the rotary body 2 is connected to the engine and the centrifugal force acting on the rotary body 3 is increased in a state where the rotary body 2 is rotated at a predetermined or higher rotation speed, the rotary body 3 moves (is pressed) and is held at a position farthest from the center O of the rotary body 2 among the rotary surfaces 6. In this state, when the rotating body 2 vibrates in the rotational direction due to the fluctuation of the torque acting on the rotating body 2, the moment of inertia acts on the rotating body 3, and the rotating body 3 performs the reciprocating motion or the oscillating motion with a delay with respect to the vibration of the rotating body 2. The torque fluctuation is reduced by such a reciprocating motion or a swinging motion of the rotating body 3. In the embodiment of the present invention, as described above, the claw portion 4b of the holder 4 is provided with the projection portion 36 that restricts the amount of movement and the inclination angle of the holder 4 in the axial direction so as to project toward the housing 18 side. When the projection 36 comes into contact with the inner surface of the housing 18 as described above, the distance between the housing 18 and the rotor 3 in the axial direction becomes shorter than the distance between the holder 4 in the axial direction (i.e., the thickness of the holder 4 including the projection 36). Therefore, even when the holder 4 moves in the axial direction or tilts with respect to the rotation axis of the rotary body 2 due to, for example, vibration of the engine or external disturbance, the projection 36 formed on the claw portion 4b comes into contact with the housing 18, and the holder 4 returns to the normal position. That is, the retainer 4 is not detached from the rotor 3 or sandwiched between the rotor 3 and the housing 18. Accordingly, since the retainer 4 can support the rotating body 3 at a normal position (or accurately), it is possible to suppress or avoid problems such as the trajectory of the reciprocating motion (oscillating motion) of the rotating body 3 deviating from the designed trajectory, or the trajectory of the reciprocating motion of each of the plurality of rotating bodies 3 being provided being different.

When the centrifugal force acting on the rolling element 3 is small, such as when the rolling element 2 is slowly rotated or stopped about the rotation center axis, the rolling element 3 freely falls (moves downward) in the rolling chamber 5 by gravity. In such a case, for example, when the rotator 3 is supported by only one claw 4b of the pair of claws with respect to the rotator 3 positioned on the right side (the position of the short hand of the timepiece at 3O) with respect to the center O of fig. 1 or the rotator 3 positioned on the left side (the position of the short hand of the timepiece at 9O) with respect to the center O, the posture of the retainer 4 becomes unstable. However, in the embodiment of the present invention, even in such a case, since the projection 36 is formed on the claw portion 4b, the retainer 4 is returned to the normal position by the contact of the projection 36 with the housing 18 as described above, and therefore, the retainer 4 is not separated from the rotating body 3 or sandwiched between the rotating body 3 and the housing 18, and the rotating body 3 can be supported correctly. Therefore, the operation of the rotating body 3 that hinders the swinging motion can be suppressed or avoided. Further, although the centrifugal force acting on the rolling elements 3 is reduced by the reduction of the rotational speed of the rotating body 2 and the rolling elements fall freely, the rolling elements 3 are supported by the retainer 4, and the gravitational force generated by the rolling elements 3 positioned on both sides with respect to the center of the retainer is balanced by the retainer 4, so that the free fall of the rolling elements 3 and the resulting impact noise can be suppressed or avoided.

In the embodiment of the present invention, as described above, the protrusion 36 is provided in the portion of the claw portion 4b where the distance between the holder 4 and the housing 18 is the shortest. Therefore, the amount of increase in the claw portion 4b as the projection portion 36 can be kept to a minimum, and as a result, an excessive increase in the mass of the retainer 4 can be suppressed. Further, by limiting the amount of movement and the inclination angle of the holder 4 in the axial direction by the minimum increase in the amount of the claw portions 4b, the number of components can be reduced and an increase in cost can be suppressed or avoided, for example, as compared with a case where a member for limiting the amount of movement of the holders 4 in the axial direction is separately provided by connecting the holders 4 provided with the rotating body 2 therebetween.

Next, another embodiment of the present invention will be described. In the above embodiment, examples are shown in which: in the case 18, the distance of the rotating body 2 from the first case member 19 and the distance of the rotating body 2 from the second case member 20 are the same, and the first case member 19 and the second case member 20 are the same in shape. On the other hand, the distance from each of the

case members

19, 20 to the rotary body 2 and the shape of each of the

case members

19, 20 may be different in each of the first case member 19 and the second case member 20. The amount of increase of the claw portion 4b (i.e., the size of the protrusion 36) may be appropriately changed according to the shape of each of the

case members

19 and 20 and the distance from the rotating body 2. That is, the design may be appropriately changed in consideration of the mounting aspect such as the shape of the members disposed around the pendulum torsional vibration reducer 1.

Fig. 6 is a view showing this example, and fig. 6(a) shows an example in which although the shapes of the

respective case members

19, 20 are the same, the distance between the first case member 19 and the rotary body 2 and the distance between the second case member 20 and the rotary body 2 are different. Specifically, the first case member 19 is shorter in distance from the rotary body 2 than the second case member 20 is from the rotary body 2. Along with this, the projection 36, which is an increased amount of the claw portion 4b, is also configured such that the increased amount is smaller on the first case member 19 side than on the second case member 20 side, and the projection 36 is smaller.

Next, fig. 6(b) shows an example in which the distance between the rotor 2 and the first case member 19 is the same as the distance between the rotor 2 and the second case member 20, and the shapes of the first case member 19 and the second case member 20 are different from each other. For example, when the pendulum torsional vibration reduction device 1 is incorporated into the torque converter 21 described with reference to fig. 3, the shapes of the first case member 19 and the second case member 20 are deformed in accordance with the shapes of the turbine 26 and the lock damper 29 disposed at the position adjacent to the pendulum torsional vibration reduction device 1. In this example, the amount of increase of the claw portion 4b (the size of the protrusion 36) is the same. On the other hand, the position and size of the projection 36 may be changed, and this example is shown in fig. 6 (c). Specifically, the projection 36 on the first case member 19 side is formed at the tip end portion 4c of the claw portion 4b, and the size of the projection 36 is made smaller (the amount of increase is small) than that on the second case member 20 side. In contrast, the projection 36 on the second case member 20 side is formed on the inner peripheral side of the projection 36 on the first case member 19 side, and is larger (more increased) than the projection 36 on the first case member 19 side.

In each of the above embodiments, the claw portion 4b is formed with a projection 36 projecting toward the housing 18 side, and the amount of movement and the inclination angle of the retainer 4 are regulated. On the other hand, this structure is not limited to the claw portion 4b side, and the projection 38 for regulating the amount of movement and the inclination angle of the retainer 4 may be provided on the case 18 side. Fig. 7 shows an example in which the projection 38 is provided on the housing 18 side. Specifically, the same-sized protrusions 38 are formed toward the claw portions 4b, respectively, at positions of the inner surfaces of the first case member 19 that oppose the claw portions 4b of the holder 4 in the axial direction and at positions of the inner surfaces of the second case member 20 that oppose the claw portions 4b of the holder 4 in the axial direction.

More specifically, the protrusion 38 is configured to limit the amount of movement or the inclination angle of the holder 4 in the axial direction by the contact of the protrusion 38 with the holder 4 when the holder 4 moves in the axial direction of the rotary body 2 so as to approach the inner surface of the housing 18 (e.g., the second case member 20) or inclines with respect to the rotation axis of the rotary body 2. In the example shown in fig. 7, when the protrusion 38 provided on the inner surface of the housing 18 comes into contact with the holder 4, the distance between the housing 18 and the rotor 3 in the axial direction becomes shorter than the thickness of the holder 4 in the axial direction. That is, by forming the projection 38 on the inner surface of the housing 18, the distance between the housing 18 and the rotating body 3 in the axial direction becomes shorter, that is, the distance from the end surface of the portion of the housing 18 where the projection 38 is formed to the rotating body 3 becomes shorter than the distance of the retainer 4 in the axial direction (that is, the thickness of the retainer 4).

Further, when describing the relationship of the rotary body 2, the rotary body 3, and the retainer 4, the distance in the axial direction from the rotary body 2 to the position where the rotary body 3 is retained by the retainer 4 when the protrusion 38 is in contact with the retainer 4 becomes shorter than the distance in the axial direction from the rotary body 2 to the end portion on the inner surface side of the second shell member 20 in the rotary body 3 when the rotary body 3 moves in the axial direction in the direction separating from the inner surface of the second shell member 20.

The projections 38 formed on the first and

second case members

19 and 20 are provided with a predetermined gap in consideration of the operation of the rotating body 3. For example, in the example shown in fig. 7, since the rolling member 3 is formed in an H-shape, it can move in the axial direction within a range sandwiched by the flange portions 7a and 7b (i.e., the thickness of the shaft portion 10). Therefore, the protrusions 38 are formed on the first case member 19 and the second case member 20 in a state where a gap is provided to an extent that takes into consideration the amount of movement thereof. The protrusion 38 may be provided on the entire circumference of the inner surface of the housing 18, or may be provided only on a portion of the inner surface of the housing 18 that faces the claw portion 4b of the holder 4. The protrusion 38 is made of, for example, a resin material as in the above example.

The configuration of forming the projection 38 on the housing 18 side may be appropriately changed according to the shape of the peripheral members of the pendulum torsional vibration reducer 1, as in the configuration shown in fig. 6(a) to 6 (c). Fig. 8(a) to 8(c) show this example. The shapes of the first case member 19 and the second case member 20 are the same as those of the examples shown in fig. 6(a) to 6(c), and therefore, the description thereof will be briefly described. Fig. 8(a) is a diagram showing an example in which the distances between the

respective case members

19 and 20 and the rotor 2 are different, and the distance between the first case member 19 and the rotor 2 is short. Accordingly, the projection 38 on the first case member 19 side is smaller than the projection 38 on the second case member 20 side. In fig. 8(b) and 8(c), the first case member 19 and the second case member 20 have different shapes, and in the example of fig. 8(b), the size of the protrusion 38 is the same on the first case member 19 side and the second case member 20 side, and in the example of fig. 8(c), the size of the protrusion 38 is larger on the second case member 20 side than on the first case member 19 side.

In this way, even when the projection 38 for regulating the amount of movement and the inclination angle of the retainer 4 in the axial direction is provided on the inner surface of the housing 18, the same operation and effect as those in the case where the projection 36 is provided on the claw portion 4b can be obtained. That is, even in the case where the retainer 4 is moved in the axial direction and in the case where the retainer 4 is inclined with respect to the axial direction, since the projection portions 38 formed on the inner surface of the housing 18 are brought into contact with the claw portions 4b, the retainer 4 is returned to the normal position supporting the rotating body 3, and as a result, it is possible to avoid the retainer 4 from being sandwiched between the rotating body 3 and the housing 18 or from being disengaged from the rotating body 3. Further, since the rolling elements 3 can be supported by the retainer 4 at the normal position, it is possible to suppress or avoid a situation where the locus of the reciprocating motion (oscillating motion) of the rolling elements 3 deviates from the designed locus or where the loci of the reciprocating motions of the rolling elements 3 differ from each other.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above examples, and may be modified as appropriate within the scope of achieving the object of the present invention. In short, the present invention may be configured to limit the amount of movement and the inclination angle (i.e., the backlash) of the retainer 4 in the axial direction. Thus, for example, the portion where the protrusion 36 is formed on the claw portion 4b is not limited to the tip portion 4c of the claw portion 4 b. For example, the projections 36 may be formed near the base portions of the claw portions 4b or the annular portions 4a, and by forming the projections on the base portions of the claw portions 4b or the annular portions 4a in this manner, the rolling body 3 can be supported at a normal position, and the rigidity of the retainer 4 can be increased.

In each of the above embodiments, the retainers 4 are provided on both sides with the rotating body 2 interposed therebetween, but the retainers 4 may be provided only on one of the first case member 19 side and the second case member 20 side. Further, in the above embodiments, the example in which the rotor 3 is formed of the "H" shape having the flanges 7a and 7b was explained, but the flanges 7a and 7b may be provided with the flange 7a (7b) only on one side. The rotor 3 may be simply cylindrical as well as "H-shaped". When the rolling member 3 is simply cylindrical, it is preferable to use the rolling member 3 having a predetermined length in the axial direction so that the rolling member 3 does not fall off the rolling chamber 5.

Description of the reference numerals

A device for reducing torsional vibration of 1 DEG-pendulum type, 2 DEG-pendulum-type, 3 DEG-pendulum-type, 4 DEG-retainer (connecting member), 4a DEG-ring-shaped portion, 4b DEG-claw portion, 4c DEG-tip portion, 5 DEG-rotation chamber, 18 DEG-housing, 19 DEG-first housing member, 20 DEG-second housing member, 36, 38 DEG-protrusion (restricting portion).

Claims

1. A pendulum type torsional vibration reduction device is provided with: a rotating body that is rotated by transmission of torque; a rotating chamber formed in the rotating body in parallel in a circumferential direction; a plurality of rotating bodies held by the rotating body in a state of being inserted into the rotating chamber; a connecting member that connects the plurality of rotating bodies so as to maintain a predetermined interval in a circumferential direction of the rotating bodies, and that rotates relative to the rotating bodies in accordance with movement of the rotating bodies in the rotating chambers; and a housing attached to the rotating body so as to cover the rotating body and the connecting member, the rotating body reciprocating inside the rotating chamber along the rotating chamber by torque fluctuation acting on the rotating body, the torque fluctuation being reduced by the reciprocating motion of the rotating body,

a restricting portion is provided on at least one of the connecting member and an inner surface of the housing,

the restricting portion is in contact with the connecting member or an inner surface of the housing in a case where the connecting member moves in a direction of a rotation axis of the rotating body in proximity to the inner surface of the housing or is inclined with respect to the rotation axis,

the distance of the housing from the rotor in the direction of the rotation axis becomes shorter than the thickness of the coupling member in the direction of the rotation axis,

the restricting portion is provided to the connecting member and is formed to protrude toward an inner surface of the housing.

2. The pendulum torsional vibration reduction device of claim 1,

the coupling member has an annular portion having an outer diameter such that it does not contact the rotating body in the rotating chamber, and claw portions provided to protrude outward in a radial direction from an outer peripheral portion of the annular portion and holding the rotating body with respect to a circumferential direction of the rotating body from both sides in the circumferential direction of the rotating body,

the restriction portion is formed at the claw portion.

3. The pendulum torsional vibration reduction device of claim 2,

the restricting portion is formed at a portion of the claw portion where a distance between the housing and the connecting member in the direction of the rotation axis is shortest.

4. A pendulum type torsional vibration reduction device is provided with: a rotating body that is rotated by transmission of torque; a rotating chamber formed in the rotating body in parallel in a circumferential direction; a plurality of rotating bodies held by the rotating body in a state of being inserted into the rotating chamber; a connecting member that connects the plurality of rotating bodies so as to maintain a predetermined interval in a circumferential direction of the rotating bodies, and that rotates relative to the rotating bodies in accordance with movement of the rotating bodies in the rotating chambers; and a housing attached to the rotating body so as to cover the rotating body and the connecting member, the rotating body reciprocating inside the rotating chamber along the rotating chamber by torque fluctuation acting on the rotating body, the torque fluctuation being reduced by the reciprocating motion of the rotating body,

the coupling member has an annular portion having an outer diameter such that it does not contact the rotating body in the rotating chamber, and claw portions provided to protrude outward in a radial direction from an outer peripheral portion of the annular portion and contacting and holding the rotating body with respect to a circumferential direction of the rotating body from both sides in the circumferential direction of the rotating body,

the restricting portion is formed on an inner surface of the housing, and is protrudingly formed at a portion opposed to the claw portion in the direction of the rotation axis.

5. The pendulum torsional vibration reduction device of any one of claims 1 to 4,

the housing is constituted by a first shell member and a second shell member sandwiching the rotating body,

the size of the regulating portion may be the same size or different sizes on the first case member side and the second case member side.

6. The pendulum torsional vibration reduction device of any one of claims 1 to 4,

the first shell member and the second shell member are different shapes.

7. The pendulum torsional vibration reduction device of claim 5,

the first shell member and the second shell member are different shapes.